Two Wire and USB host sheild help

Hi, my names Ryan. I am still new to Arduino and have run into a problem. I have acquired a USB host sheild and was looking to make it work with a Motor sheild I have. I contacted the creator of the sheild but not to much avail. I learned the motor sheild must be on another Arduino if I didn't want to hack and wack it. So I looked into the Two Wire library and was wondering if I could use this to communicate between the two. Will this work or should I just abandon ship now? Thanks, Ryan